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Fix dns pool logic #179

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Fix dns pool logic #179

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Solves #178

@daurnimator
dns.resolvers: Use resolver from pool if there is something in pool
7566e46 
Previously this would always leave/ignore one resolver in the pool
@daurnimator
dns.resolvers: Avoid potential infinite loop waiting for a resolver
1bcd9f4 
Previously if there was nothing in pool but more than hiwat resolvers alive, then this would busy loop (not even yielding)
@daurnimator
Add regression test for issue wahern#178
d3ec712
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